There's no doubt that on many subjects our thoughts are in a maze. Some of these subjects may represent concrete concepts and some may represent abstract concepts, and most of these subjects will remain mysteries to us as long as we live. Some of these subjects that were mysteries to me I have listed in the following pages for you to think about. Perhaps a few of them will not be or stay mysteries to you. That is good. That is what progress is all about. You may wonder about the variety of the subjects and why some of them should represent mysteries to me. I will try to explain this as well as I can. It has been my experience that many apparently simple subjects do not represent mysteries to me as long as I do not give them much thought. But as soon as I start delving deeper into these subjects, mysteries pop up, and I find myself, my thoughts, in a maze.